Effect of ultrafine fly ash on properties of concretes containing construction and demolition wastes as coarse aggregates
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This paper presents preliminary results on the effect of ultrafine fly ash (UFFA) on the properties of concretes containing recycled coarse aggregates (RCA) originated from construction and demolition (C&D) wastes. The effect of 10% UFFA on compressive strength, tensile strength, sorptivity and chloride ion permeability of concretes containing 25% and 50% RCA is evaluated at 7, 28 and 56 days. The addition of UFFA increased the compressive strength of recycled aggregates concretes at all ages up to 56 days. However, a slight reduction in the tensile strength of recycled aggregate concretes is observed. Concrete containing 25% RCA and 10% UFFA achieved 94% of the control concrete's compressive strength at 56 days. In both recycled aggregate concretes the sorptivity and chloride ion permeability are much lower at all ages due to the addition of 10% UFFA given the fact that it acts to promote the hydration and block the large capillary pores within the concrete.
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Effect of ultrafine fly ash on the properties of concretes containing construction and demolition wastes as coarse aggregatesShaikh, Faiz (2016)This paper presents the preliminary results of the effect of ultrafine fly ash (UFFA) on the properties of concretes containing recycled coarse aggregates (RCA) originating from construction and demolition (C&D) wastes. ...
Shaikh, Faiz; Nguyen, H. (2013)The incorporation of mixed construction and demolition (C&D) wastes as a substitute to natural aggregates (NA) has many economic and environmental benefits. In this paper, the results of an investigation on the effect of ...
Shaikh, Faiz (2013)Concrete is a composite material consisting of mortar and coarse aggregates. The use of recycled aggregates in concrete is increasing gradually. Recycled coarse aggregates are highly porous and often contain micro-cracks ...